Wear resistant assembly

ABSTRACT

A wear resistant assembly including a metal support structure and ceramic plate members attached thereto. The ceramic plates each have at least one hole therethrough which has a tapered bottom and a metal insert is disposed in the hole, the insert being cup shaped and having its bottom welded to the metal support for attaching the ceramic plates to the metal support. The metal insert is circumferentially contractable so that when it is inserted into the hole it is frictionally retained in the hole for shipment, etc.

United States Patent Perigo et al.

WEAR RESISTANT ASSEMBLY Inventors: Leon A. Perigo, Arvada; John A.

Jordan, Denver, both of Colo.

Assignee: Coors Porcelain Company, Golden,

Colo.

Filed: Aug. 13, 1971 Appl. No.: 171,661

US. Cl. 52/127, 287ll89.36 B Int. Cl. 823k 9/00, Fl6b 5/08 Field 01Search 52/127, 506, 513,

References Cited UNITED STATES PATENTS 11/1971 Kutzer 2l9/l27 12/1958Van Voorden 52/378 7/1954 Robertson.......... 52/426 4/1971 Licari287/l89.36 B

[451 July 24, 1973 2,021,610 11/1935 Quint ..52/513 FOREIGN PATENTS ORAPPLICATIONS 899,672 6/1962 Great Britain 52/506 Primary Examiner-PriceC. Faw, Jr. Attorney-McGlynn, Reising et al.

[57] ABSTRACT 3 Claims, 4 Drawing Figures FATHER- 3. 747. 291

INVENTORS 601? A ezzigo 5 e/55w .4 fizz/m2 ATTORNEYS WEAR RESISTANTASSEMBLY There are many situations in which it is desirable to attach anon-metallic wear resistant member to metal, as for example, theattachment of aluminum oxide ceramic plates to a metal backing member.More specifcally, such ceramic plates are frequently attached to metalsupport or backing members in chutes or spouts, in certain conveyors,etc. The ceramic plates have a higher resistance to wear than metals.

This invention relates to the attachment of such ceramic plates to ametal support member. In accordance with the instant invention, aceramic plate has a hole extending from the outward face to the inwardface and a metal insert is disposed in and frictionally retained in thehole so that the insert remains in position during shipment of theceramic plates and during handling and placement into position forwelding the insert to the metal support member. The invention overcomesthe problem of retaining a metal insert in a hole in a ceramic platewhile the ceramic plate is being positioned for welding the insert to ametal backing member.

Accordingly, it is an object and feature of this invention to providesuch a wear resistant assembly which includes a non-metallic memberhaving a hole extending therethrough and a metallic member frictionallyheld in the hole.

' In correlation with the foregoing object and feature, it is anotherobject and feature of this invention to provide such an assembly whereinthe metal insert is contractable so as to be self-biasing outwardly tofrictionally engage the hole in the non-metallic member.

In correlation with the foregoing objects and features, it is anotherobject and feature to provide such an assembly wherein the metal insertis circular with a centrally disposed opening therethrough and a slotextending from the opening to the periphery thereof whereby the insertis circumferentially contracted when forced into the hole so as to befrictionally retained therein.

In correlation with the foregoing objects and features, it is anotherobject and feature of this invention to provide such an assembly whereinthe insert is frusto-conical with a base and a side wall extendingupwardly and outwardly therefrom with the opening being in the base andthe slot extending radially out wardly therefrom.

Other objects and attendant advantages of the present invention will bereadily appreciated as the same becomes better understood by referenceto the following detailed description when considered in connection withthe accompanying drawings wherein:

FIG. 1 discloses a chute or tunnel through which abrasive materials maypass. 1

FIG. 2 is a cross sectional view of a preferred embodiment of theinstant invention;

FIG. 3 is an enlarged cross sectional fragmentary view takensubstantially along 22 of FIG. 1; and

FIG. 4 is an exploded perspective view partially in cross section of asingle ceramic plate utilizing the attaching means of the instantinvention.

The assembly includes a metal support structure comprising the walls 10.Attached to the walls are a plurality of wear resistant non-metallicplate members 12. The plate members 12 are preferably an aluminum oxideceramic. Non-metallic for the purposes of description meansnon-weldable, as for example a modified boron carbide including asilicone.

Each ceramic plate 12 has a hole generally indicated at 14 extendingtherethrough from the outward face 16 to the inward face 18 of theceramic plate 12. g

A metallic insert generally shown at 20 is frictionally held in the hole14 whereby the insert may be welded to the metal support structure 10for attaching the associated ceramic plate 12 thereto. The insert 20 iscontractable so as to be self-biasing outwardly to frictionally engagethe hole 14.

More specifically, the hole 14 is configured to prevent the insert 20from being moved through the hole 14 toward the inward face 18 byincluding a frustoconical portion 22 adjacent the inward wall 18.

The insert 20 is generally annular in configuration therethrough. Theinsert 20 is rendered circumferentially discontinuous by with acentrally disposed open ing 24 therethrough and a slot 26 extending fromthe opening to the periphery of the insert whereby the insert iscircumferentially contracted when forced into the hole 14 so as to befrictionally retained therein. The hole 14 includes a cylindricalportion 28 which extends upwardly from the conical portion 22. As theinsert 20 is forced into the hole 14, the insert circumferentiallycontracts so as to engage the cylindrical surface 28 The insert 20 isfrusto-conical with a base 30 and a side wall 32 extending upwardly andoutwardly from the base 30. The opening 24 is disposed centrally withinthe base 30 and the slot 26 extends radially outwardly from the opening24.

The frusto-conical portion 22 of the hole 14 coacts with the side wall32 of the insert as illustrated in FIG. 2.

FIG. 2 shows the assembly in position for welding the metal insert 20 tothe metal backing wall 10. The metal insert 20 is in frictionalengagement with the hole 14 and is therefore prevented from falling bygravity out of the hole 14. An installer may therefore hold the plate 12in position with one hand and inject a welding rod into the hole 14 withthe other hand to weld theinsert 20 to the metal wall 10.

The assembly also includes a ceramic plug 34 for insertion into the hole14 after the insert is welded to the metal support structure. This ismore specifically shown in FIG. 3 wherein the insert 20 is shown weldedto the metal wall 10 and the plug 34 is disposed in engagement with thecylindrical wall portion 28 of the hole 14. The ceramic plug 34 coversthe insert 20 and forms a part of or is coplanar with the outward wall16. The ceramic plug may be disposed in position with an appropriateadhesive.

It will be appreciated that the ceramic plates 12 may be shipped fromtheir place of manufacture with the inserts 20 disposed therein and thatthe inserts 20 will not be inadvertently removed or fall from the holes14. Further, when the ceramic plates 12 are being positioned forwelding, there need not be concern for placement of the metal insertsbecause the inserts are frictionally retained in position and may beappropriately welded to the metal support structures such as the walls10;

The invention has been described in an illustrative manner, and it is tobe understood that the terminology which has been used is intended to bein the nature of words of description rather than of limitation.

Obviously, many modifications and variations of the present inventionare possible in light of the above teachings. It is, therefore, to beunderstood that within the scope of the appended claims, the inventionmay be practiced otherwise than as specifically described.

We claim:

1. Apparatus for securely affixing at least one wearresistant ceramicplate to an underlying weldable metallic surface comprising incombination: a wearresistant ceramic plate having first and secondopposite surfaces, said second surface being configured to liesubstantially against said underlying surface, said plate having a holeformed therein and extending fully between said first and secondsurfaces, said hole having a tapered portion the diameter of whichdecreases toward said second surface to form a socket, a weldablemetallic insert of generally annular configuration having a base andtapered sides dimensioned to seat securely within and in frictionalengagement with said socket such that the base is substantially adjacentsaid underlying surface, said base being open to expose a portion ofsaid underlying surface when the insert is disposed within said socket,said insert being circumferentially discontinuous and of such diameterrelative to said socket as to be contracted when seated into said socketto be frictionally retained therein before and during welding of theinsert to the underlying surface irrespective of the orientation of theplate.

2. Apparatus as defined in claim 1 wherein said insert is renderedcircumferentialy discontinuous by means of an axial slot extending fullythrough said base and tapered sides.

3. Apparatus as defined in claim 1 including a ceramic plug disposedwithin said hole between said first surface and said insert to concealsaid insert and to fill said hole.

Patent No. 3,147,191 Dated only 24, 1973 Inv'entor(s) Leon A. Perigo;John A. Jordan It is certified that error appears in theabove-identified patent and that said Letters Patent are herebycorrected as shown below:

' Col. 2, lines 16-19, delete "The insert 20 is generally annular inconfiguration therethrough. The insert 20 is rendered 'circumferentiallydiscontinuous by with a centrally disposed opening 24 therethrough and",and inserttherefor --'1 h'e insert 20' is generally annularconfiguration with a centrally disposed opening 24 therethrough. Theinsert 20 is rendered circumferentially discontinuous Signed and sealedthis 9th day of April 197A.

(SEAL Attest:

EDWARD M.ELETGEEE,JE. c. MARSHALL DANN Attesting Officer a Commissionerof Patents FORM PC4050 (10-69) I USCOMM-DC scan-Pas fi U.S. GOVERNMENTPRINTING OFFICE: I969 0-366-334

1. Apparatus for securely affixing at least one wear-resistant ceramicplate to an underlying weldable metallic surface comprising incombination: a wear-resistant ceramic plate having first and secondopposite surfaces, said second surface being configured to liesubstantially against said underlying surface, said plate having a holeformed therein and extending fully between said first and secondsurfaces, said hole having a tapered portion the diameter of whichdecreases toward said second surface to form a socket, a weldablemetallic insert of generally annular configuration having a base andtapered sides dimensioned to seat securely within and in frictionalengagement with said socket such that the base is substantially adjacentsaid underlying surface, said base being open to expose a portion ofsaid underlying surface when the insert is disposed within said socket,said insert being circumferentially discontinuous and of such diameterrelative to said socket as to be contracted when seated into said socketto be frictionally retained therein before and during welding of theinsert to the underlying surface irrespective of the orientation of theplate.
 2. Apparatus as defined in claim 1 wherein said insert isrendered circumferentialy discontinuous by means of an axial slotextending fully through said base and tapered sides.
 3. Apparatus asdefined in claim 1 including a ceramic plug disposed within said holebetween said first surface and said insert to conceal said insert and tofill said hole.